Or it is just a charade to make it look like Telegram is not controlled by the kreml
Secure messaging is hard, most people when producing secure messaging will produce poor secure messaging - it doesn't mean they've been compromised by a government.
It's one thing to get some security wrong because its "hard." It's another to not fix those problems when people explain how and why you did something wrong.
RSA encryption is theoretically breakable by quantum computers, but people still use it and gonna be using it until someone break it.